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Effect › Color Effects › Duotone… (addon.color.duotone, also in Object › Plug-ins › Color Effects) prints the grey-equivalent tone of each colour with one to four inks, each with its own tone curve. It is a colour adjustment like the add-on's others, so it stacks with them and works as a filter through addon.color.filter. - One tone of a swatch the document has gives a tint of that swatch, linked, so a spot tone separates onto its plate; several tones give the CMYK mix of their tints (the inks overprint, so they multiply). - Colour adjustments now map paints with their swatch links (ColorMap::apply_link); the existing adjustments behave as before. - Skip Objects with Spot Colors leaves spot-linked colours as they are. - The dialog has a row per tone and the picked tone's curve (the Curves graph, reused), its points and Reset to Linear / Inverse. Print Ink Fixes (addon.color.printFixes, Object › Plug-ins › Color Effects › Print Ink Fixes…) scales CMYK colours over a total ink limit down to it, removes white overprint and sets black overprint (Overprint Black's logic) in a CMYK document, as one undo step, and reports what changed. RGB documents are refused. The panel opens both under Inks. Deferred: an opaque undercoat, tones for type only, extra gradient stops for smoother tints, curve flip and all-100 % buttons.